Vir or VIR can refer to:
- Vir, (Latin) man, husband
- Vir, an island in the Adriatic Sea
- Vir, abbreviation for the constellation Virgo
- Vir (crustacean), a shrimp genus
- Vir Cotto, a central character in the science fiction television series Babylon 5
- VIR, abbreviation for "Vascular and Interventional Radiology"
- VIR, United States Virgin Islands ISO 3166-1 alpha-3 country code
- VIR, abbreviation for the Vertical Interval Reference in an NTSC video signal
- VIR, Virgin Atlantic Airways ICAO airline designator
- VIR, Virginia International Raceway
- VIR, Virginia Water railway station code
- VIR, Victoria Imperatrix Regina (Latin for Victoria, Empress and Queen)
- VIR, Visual and infrared spectrometer, an instrument aboard Dawn spacecraft
- V = IR, the formula describing voltage in terms of current and resistance.
- VIR, the IATA code for Virginia Airport in Durban, South Africa.